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Rotary dynamic continuous preparation method for titanium black powder

A rotary dynamic, titanium oxide technology, applied in the direction of titanium oxide/hydroxide, etc., can solve the problems of large temperature influence of upper and lower products, hindering reaction speed, and uneven reaction.

Inactive Publication Date: 2015-09-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to uneven heat transfer, the temperature field of the material is uneven, and the upper and lower layer products are greatly affected by the temperature
At the same time, the raw material is easy to absorb water and it is difficult to dry completely. The adsorbed water will volatilize to generate water vapor during the high temperature reaction. In addition, the reaction itself will generate water vapor and CO in a reducing atmosphere. 2 Gases, which are not exhausted in time in conventional furnaces, hindering the reaction rate and causing inhomogeneous reactions
In addition, due to process defects, the product is easily absorbed by the trace amount of O contained in the environment when it is cooled. 2 oxidation
These factors lead to the final product being a mixed phase of different substances, and it is difficult to obtain high-quality single-phase titanium dioxide powder with a purity higher than 70%, which seriously affects its performance and limits its wide application.

Method used

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  • Rotary dynamic continuous preparation method for titanium black powder
  • Rotary dynamic continuous preparation method for titanium black powder
  • Rotary dynamic continuous preparation method for titanium black powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] In this embodiment, the rotary dynamic continuous sintering device such as figure 1 , figure 2 As shown, it consists of a material storage chamber 1, a screw feeder 2, a furnace tube 3, a furnace tube drive mechanism, a heating furnace 4, a collection chamber 5, a support frame, a threaded lifter 6 and a bracket 7. The discharge end of the screw feeder is provided with an air inlet valve 19, the top of the storage chamber is provided with a sealing cover 8, the lower part is provided with a discharge control valve 9, and the discharge port at the bottom is connected with the screw feeder. The heating furnace is provided with a resistance heating device heating device 15 and a thermocouple 16 . The collection chamber is provided with an air outlet valve 18 and a material intake port equipped with a sealing cover, and a feed control valve 17 is provided at the inlet of the collection chamber. The chamber wall of the collection chamber 5 is a sandwich structure, and the...

Embodiment 2

[0100] The difference between the rotary dynamic continuous sintering device used in this embodiment and embodiment 1 is that the length of the furnace tube is 3m, and the length L2 of the heating zone of the heating furnace is 2m; the heating device of the heating furnace is an induction heating device, such as image 3 shown.

[0101] In this example, Ti 9 o 17 The process steps and operation method of the rotary dynamic continuous preparation method of powder are the same as in Example 1, and the process parameters in this example are as follows:

[0102] The weight percentage of each raw material in the step (1): H 2 TiO 3 Powder: (nano charcoal powder + titanium hydride powder) = 9:1.5;

[0103] The inclination angle of support plate in step (3) is 10 °; The gas flow velocity of 2L / min is charged into hydrogen in furnace tube with the gas flow velocity of 2L / min from the gas inlet valve 19 that screw feeder is provided with; The rotational speed of furnace tube is 1.2...

Embodiment 3

[0105] The difference between the rotary dynamic continuous sintering device used in this example and Example 1 is that the length of the furnace tube is 3m, and the length of the heating zone of the heating furnace is 2m.

[0106] In this example, Ti 9 o 17 The process steps and operation method of the rotary dynamic continuous preparation method of powder are the same as in Example 1, and the process parameters in this example are as follows:

[0107] The weight percentage of each raw material in the step (1): micron TiO 2 Powder: micron carbon black powder = 9:1;

[0108] The inclination angle of the support plate in step (3) is 45°; the gas flow rate of 1L / min is charged into the furnace tube with the mixed gas obtained by mixing hydrogen and nitrogen with a volume ratio of 30:70 from the inlet valve 19 provided by the screw feeder ; The rotation speed of the furnace tube is 0.05r / min; the temperature reached in the furnace tube is 900°C; the sintering time is 2 hours. ...

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Abstract

The invention provides a rotary dynamic continuous preparation method for titanium black powder. The titanium black powder is TiO powder, Ti3O5 powder, Ti4O7 powder, Ti5O9 powder, Ti6O11 powder, Ti7O13 powder, Ti8O15 powder or Ti9O17 powder. The push-type dynamic continuous preparation method comprises the following process steps: (1) preparing raw materials; using Ti and O compound powder and a reducing agent as the raw materials; (2) mixing and drying; (3) sintering: under an open system or a closed system or negative pressure, heating a furnace tube when the furnace tube is at an inclined state with a discharging opening lower than a feeding opening, and is at a rotary state, continuously feeding the mixed powder obtained in the step (2) into the furnace tube when the temperature in the furnace tube reaches the reaction temperature, and enabling the mixed powder, which enters the furnace tube, to pass a furnace tube heating area in a spiral movement manner to complete reaction so as to form a reaction product to fall into a collection chamber. Through the adoption of the preparation method, titanium black powder of which the single phase or the purity is higher than 70% can be obtained, and continuous mass production can be realized.

Description

technical field [0001] The invention belongs to the technical field of titanium oxide powder preparation, in particular to a dynamic continuous preparation method of titanium oxide powder. Background technique [0002] Titanium oxide has a rutile-based TiO 2 The structure of the lattice, its several different titanium oxide compounds have high electrical conductivity, and at the same time, the chemical stability is extremely high, and they have good light absorption ability in the visible light region or ultraviolet light region, which makes it a On the one hand, it can be an excellent electrode material and electrochemical catalyst carrier material for electrochemical applications, and on the other hand, it is also a very promising material for improving light absorption performance and photoelectrochemical performance. Ti 6 o 11 It is due to the polarization of the insulator generated by the electron-lattice coupling, which has antiferromagnetism. TiO has the highest c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/04
Inventor 叶金文刘颖李小磊
Owner SICHUAN UNIV
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